How do you fix asymmetric routing in FortiGate?

FortiGate can be configured to permit asymmetric routing by using the following CLI commands.

1. # config system settings. set asymroute enable.
2. # config vdom. edit # config system settings. set asymroute enable.
3. # config system settings. set auxiliary-sessions {disable | enable}

Does firewall support asymmetric routing?

The Asymmetric routing (ASR) feature is supported in both the FWSM 3. x and ASA 7. x code releases, and can be leveraged in the firewalls in active/standby and active/active modes. This feature aligns the firewalls with the Layer-3 network to avoid asymmetric routing issues.

How do you fix asymmetric routing?

The solution to this problem is to adjust the placement of the firewalls or internal routing such that traffic in both directions flows through the same firewall, even if incoming traffic enters the network through a different router than the router that handled the matching outgoing traffic.

Can FortiGate do routing?

FortiGate will first check regular policy routes before coming to SD-WAN policy routes (if any) and then the routing table. Verification of Configuration and troubleshooting. For example, generate some test traffic from the configured source ip / subnet and check on the traffic logs for the outgoing interface.

How does the FortiGate behave when asymmetric routing is disabled?

1) If the packet is a SYN, the FortiGate creates the session, checks the firewall policies and applies the configuration of the matching policy (UTM inspection, NAT, Traffic shaping, etc.). The subsequent packets of the session can be offloaded (exactly as when asymmetric routing is disabled).

How is asymmetric routing used in Cisco firewalls?

2. Support of the Asymmetric routing feature. The Asymmetric routing (ASR) feature is supported in both the FWSM 3.x and ASA 7.x code releases, and can be leveraged in the firewalls in active/standby and active/active modes. This feature aligns the firewalls with the Layer-3 network to avoid asymmetric routing issues.

Is there support for asymmetric routing in FWSM 3.x?

Support of the Asymmetric routing feature The Asymmetric routing (ASR) feature is supported in both the FWSM 3.x and ASA 7.x code releases, and can be leveraged in the firewalls in active/standby and active/active modes. This feature aligns the firewalls with the Layer-3 network to avoid asymmetric routing issues.

How does asymmetric routing affect the UDP packet?

When asymmetric routing is enabled, if the ICMP packet is not a request and the session doesn’t exist on the FortiGate, the ICMP reply will be routed if a route exists on the routing table without security inspection. UDP packet is checked by session table regardless of asymmetric routing. Asymmetric routing does not affect UDP packet.